Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Using GCLK by a Quartz Crystal

Hi all, Can I use a quartz crystal to drive the GCLK pin of FPGAs? I mean just like the microcontroller XTAL pin which needs a quartz crystal with 2 capacitors? Thanks in advance.
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

That's an interesting question, though! Has anybody here ever tried to use the FPGA itself to build a crystal oscillator? It's quite easy to have a simple inverter from on pin to another. So after configuration, the FPGA should oscillate with the crystal. Any experience with that?